Circulating air heater



J. CASSADY.

CIRCULATING AIR HEATER. APPLICATION men 0:029, 1919.

' 1,402,728, 7 Patented Jan. 3, 1922.

5 ATTORNEY ans ea-TNT on on.

JOHN cAssAn-Y, or RITZVILLE, WASHINGTON, ASSIGNOR ro CASSADY SPECIALTY COMPANY, or nrrzvrnnn, WASHINGTON, A coeronerroN or WASHINGTON.

CIRGULATING AIR HEATER:

annexes.

Application filed December 29, 1919. Serial No. 347,977.

To all whom it may concern:

Be itknown that 1, JOHN CASSADY, a citizen of the United States, residing at Ritzville,in the county of Adams and State of Washington, have invented new and ,useful Improvements in Circulating Air Heaters, of which the following is a specification.

This invention relates to improvements in heaters and has to do more particularly with circulating air heaters.

One of the objects of this invention is to provide an air heater which may be applied as an attachment to any kind of a stove having a stove top portion from which the heated ascending air may be received into the heater, the device of my invention being particularly adapted for us on 011, gas,

gasoline, electric or other types of ranges.

A further object of the invention is to collect the relatively colder air near the floor of the room and utilize, such air as an air feed to the heater so that as the air is heated it will be discharged near the top of the heater thereby creating a circulation of air'in the room from the floor plane to an elevation slightly above the breathing zone of an upright adult of the average height. Thus, that area of the room which, for the purpose of illustration might be termed the habitable portion, will be warmest, irrespective of the temperature near the ceiling zone.

My invention also involves the novel feature of a heater whichis partly supported on the stov or rzu ge and partly on the floor, thereby insuring stability of the heater while in position, and rendering it easy to apply or remove from position without any attaching device. In this connection, it is a feature of my invention'to provide a heater of this character which is adjustable whereby it may be applied to ranges or stoves of different heights.

It is a further feature of my invention to separate the incoming cold air, entering the heater, from thecntering heated air ascendingfrom the stove or range, in such a man ner, that the entering cold air will not ob-f jectionably cool th heated air, and this feature of the invention includes an improved spreader for the enteringcold air which is itself heated by the entering hot air ascend ing into the heater from the stove, whereby the spreader will to a great extent act as a pre-heater for the entering cold air, this Patented Jan. 3,

nection with the accompanying drawing and will be moreparticularly pointed out in and by the appended claim.

In thedrawing:

Flgllle 1, is a view in side elevation of my lmproved heater applied toa gas or Oll range. I V

Figure 2, is an enlarged vertical sectional vlew of the heater removed from the range.

Figure 3 is a sectional view on line 3--3 of Figure 2.

Like characters of reference designate similar parts throughout the differentparts of the drawing,

is shown, my invention is applied to the grid 1, of a gas, oil or other stove 2, although its appllcation and utility is not limited to these particular types of stoves as it may be applied to any stove having a heating stove My invention includes a heatingdrum 3, the upper portion of (which is preferably closed by a lid 4:. The drum 3 is cylindrical and 1 preferably taper the upper portion thereof, as indicated at 5. In th tapered portion 5 isa plurality of hot air'discharge openings 6, the aggregate capacity of which will be considerably less than the capacity of the major portion of the drum for conveying hotair. Thus to a certain extent, the constriction afforded by these openings 6 will be suhicient to retain and restrict the passage of the hot air from the drum 3 not only long enough to permit the air to be heatedbut also to permit the hot air to thoroughly heat and maintain the drum heated so that the latter will radiate heat to the surroundin air. Furthermore, the drum 3 is .of sui lcient height to dispose the discharge openings 6 substantially above the head of an upright adult so that the heated air will be discharged at such an elevation in the room that it will be effective to that area which is mostly inhabited by the human being.

The lower rim 7, of the drum 3, is adapted to seat on a stove grid and could, if slightly elevated, be seated upon the top of an ordinary cooking stove, it being the function of the lower open end 8 to receive V the cold air pipe 9 extends downwardly at Thus my invention includes a cold air inlet pipe 9 which as shown delivers to the drum 3 preferably laterally thereof, the opening 10, for the cold air, being nearly adjacent the opening-8, for the heated air. Furthermore,

by branching off the inlet pipe 9 from the drum 3, the device of my invention becomes readily adaptable for application to a stove without requiring any modification of the latter or any attaching devices whatsoever.

Thus while the drum 3,0verhangs the grid,

one side of the stove.

In view of the fact that different makes of stoves have different heights from the floor 11, I desirably incorporate an adjusting feature in the device of my invention so that the latter will not have to be modified for application to different stoves. Thus 9, designates the upper section of the cold air pipeand 12 designates alower section which adjustably telescopes the upper section. device 13, which maybe a simple form of band clamp adapted to be tightened by a screw 14, may serve to secure the pipe sections in extensible or contractible positions of adjustment. The lower pipe section 12 is provided with legs 15 to support the lower end 16, of section 12, at such an elevation above the floor 11 as to readily permit of a cold air intake as indicated by the arrows 17. These legs 15 perform a further function in that they support the heater, or assist in supporting the heater so as to render the latter-stable in its position upon the stove. In the absence of a floor engagement, and because of the cold air pipe, the center of gravity of the heater would be shifted in such a manner as to cause the heater to be readily overturned. With the adjusting device shown, the floor supportingengagement of the cold air pipe can be so nicely adjusted with respect to the engagement of the rim 7 on the stove that the pipe 9 will readily sustain the heater in position.

It is a feature of my invention that while I specifically admit the cold air at a point very nearly adjacent the hotair intake, still, I do not permit intimate and immediate mixture of the cold and hot air; Thus it is a feature of my invention to provide a guard which 'serves to separate the cold from the hot air for a short period, and this feature of to spread the incoming cold air. I

As illustrated, this feature of my invention is embodied in atruncated cone 18 which extends from the rim 7 upwardly into the drum 3 and the contraction of which is such that the hot air, or a portion thereof, from the stove burner, will impinge upon the guard 18, as indicated by the. arrows 19. Furthermore, the top 20 of the guard 18 is slightly higher than the top "of opening 10, so that as'the hot air expands upon-its discharge from the guard 18, it will be delivered toward the wall f'the drum 3 at a point above the incoming cold air entering through opening 10. Thus there will be'a very slight pressure of the hot air seeking egress from the contracted end 20 which will greatly promote the air fiow.

It will now be seen how the guard 18 acts as a spreader and a heater since a portion of the air passing through pipe 9 will flow against the guard, as indicated by arrow 21, and thence upwardly. In its engagement with the guard, the cold air will be heated slightly, sufliciently to remove the ,chillthere by avoiding the disadvantage ofquickly lowering the temperature of the interior of the 10 drum. 'By reason of the fact that the device of my invention is disposed directly upon the stove, a great deal of theheat therefrom will be transmitted directly to the drum and the guard. V

It is believed that my invention will be fully understood from the foregoingdescription', and while I have herein shown and described one specific form of my invention, I do not wish to be limited thereto except for 110 such limitations as the claim may import.

I claim 3- V Ina circulating air heater attachment for application to a stove top, a hollow drum having the greater portion of its upper inte- 1 15 rior free from obstruction whereby the ascending cold and hot air may freely mix, the drum having aniopen'bottom adapted to be supported on the stove top to receive the heated air therefrom, a cold air pipe delivering to said drum laterally through the latter and at the lower end thereof, and a truncated conicalguard havin its'base merging into the lower end of said drum and extending upwardly in said drum to a height slightly above the cold air pipe and the converging guard forming with the drum an annular cold air inlet chamber and the guard deflect ing the cold air laterally'and upwardly as the fimy invention is further developed by concold air enters said drum, the converging guard contracting the ascending hot air flowing therethrough and thereby heating said guard to Warm the cold air as the latter engages said guard, whereby the cold and hot air will freely mix as they ascend in the upper tree portion of the drum, and said drum having outlets at its upper end of reduced discharge capacity with respect to the inlet capacity of the open bottom to increase the mixing and heating action of the 10 unobstructed portion of said drum.

In testimony that Iclaim the foregoing as my own, I hereby afiix my signature.

JOHN CASSADY. 

